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Count the same value of each row in a MySQL column?
To count the same value of each row, use COUNT(*) along with GROUP BY clause. Let us first create a table −
mysql> create table DemoTable1818 ( Id int, Name varchar(20) ); Query OK, 0 rows affected (0.00 sec)
Insert some records in the table using insert command −
mysql> insert into DemoTable1818 values(10,'Chris'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1818 values(11,'Chris'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1818 values(11,'Chris'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1818 values(12,'Chris'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1818 values(10,'Chris'); Query OK, 1 row affected (0.00 sec) mysql> insert into DemoTable1818 values(10,'Chris'); Query OK, 1 row affected (0.00 sec)
Display all records from the table using select statement −
mysql> select * from DemoTable1818;
This will produce the following output −
+------+-------+ | Id | Name | +------+-------+ | 10 | Chris | | 11 | Chris | | 11 | Chris | | 12 | Chris | | 10 | Chris | | 10 | Chris | +------+-------+ 6 rows in set (0.00 sec)
Here is the query to count the same value of each row in a column −
mysql> select Id,count(*) as TotalPerId from DemoTable1818 group by Id;
This will produce the following output −
+------+------------+ | Id | TotalPerId | +------+------------+ | 10 | 3 | | 11 | 2 | | 12 | 1 | +------+------------+ 3 rows in set (0.00 sec)
Updated on: 24-Dec-2019
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